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ViaAqua® Million Air™ Pumps
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The best all around filter is the undergravel filter. It is essentially a piece of plastic with small holes or slots in it. In one corner is a large round hole where a plastic "uplift" tube fits. An air pump and tubes are connected to the uplift tube. The installation of this type of filter is explained below.
Place the filter on the bottom of the empty tank. (They are available at in standard sizes to fit a wide range of tank sizes. For larger tanks, you can fit more than one filter plate as necessary.) The best arrangement places the holes for the uplift tubes in the rear corners where they can be hidden from view with rocks or plants. Set up the uplift tube(s) and attach clear plastic tubing and an air pump.